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Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary Dreyfus Treasury Securities Cash Management
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jun. 01, 2024
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then hold or redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The one-year example and the first year of the three-, five- and ten-years examples are based on net operating expenses, which reflect the contractual undertaking by BNY Mellon Investment Adviser, Inc. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The fund pursues its investment objective by investing only in U.S. Treasury securities, including those with floating or variable rates of interest, and cash. The fund is a money market fund subject to the maturity, quality, liquidity and diversification requirements of Rule 2a-7 under the Investment Company Act of 1940, as amended, and seeks to maintain a stable share price of $1.00.

The fund is a "government money market fund," as that term is defined in Rule 2a-7, and as such is required to invest at least 99.5% of its total assets in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, repurchase agreements collateralized solely by cash and/or government securities, and cash. The fund typically invests exclusively in U.S. Treasury securities.

By investing exclusively in U.S. Treasury securities, income paid by the fund generally will be exempt from state and local taxes. Because rules regarding the state and local taxation of dividend income can differ from state to state, investors are urged to consult their tax advisers about the taxation of the fund's dividend income in their state and locality.

Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Service shares from year to year. The table shows the average annual total returns of the fund's Service shares over time. The fund's past performance is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.dreyfus.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.dreyfus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Total Returns as of 12/31 each year (%)Service Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter
Q4, 2022: 0.64%

Worst Quarter
Q1, 2022: 0.00%

The year-to-date total return of the fund's Service shares as of March 31, 2023 was 0.87%.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.87%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2022
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.64%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

For the current yield, call toll-free 1-800-373-9387 (inside the U.S. only).
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/22
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone 1-800-373-9387
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Risk Money Market Fund Sponsor May Not Provide Support [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Neither BNYM Investment Adviser nor its affiliates have a legal obligation to provide financial support to the fund, and you should not expect that BNYM Investment Adviser or its affiliates will provide financial support to the fund at any time.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Risk Money Market Fund May Not Preserve Dollar [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Risk Money Market Fund Price Fluctuates [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock The fund's yield will fluctuate as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in securities with different interest rates.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Risk Money Market Fund May Impose Fees or Suspend Sales [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock The fund currently is not permitted to impose a fee upon the sale of fund shares (a "liquidity fee") or temporarily suspend redemptions (a redemption "gate") under distressed conditions as some other types of money market funds are, and the fund's board has no intention to impose a liquidity fee or redemption gate.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the fund.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Interest rate risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ● Interest rate risk. This risk refers to the decline in the prices of fixed-income securities that may accompany a rise in the overall level of interest rates. A sharp and unexpected rise in interest rates could impair the fund's ability to maintain a stable net asset value. Interest rates in the United States have been rising and may continue to increase in the near future. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation and changes in general economic conditions. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility and may detract from fund performance. For floating and variable rate obligations, there may be a lag between an actual change in the underlying interest rate benchmark and the reset time for an interest payment of such an obligation, which could harm or benefit the fund, depending on the interest rate environment or other circumstances.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Liquidity risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ● Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities may fall dramatically, potentially impairing the fund's ability to maintain a stable net asset value.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | U.S. Treasury securities risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ● U.S. Treasury securities risk. A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of interest and principal when held to maturity, but the market prices for such securities are not guaranteed and will fluctuate.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Market risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ● Market risk. The value of the securities in which the fund invests may be affected by political, regulatory, economic and social developments.  Events such as war, acts of terrorism, the spread of infectious illness or other public health issue, recessions, or other events could have a significant impact on the fund and its investments. Recent examples include pandemic risks related to COVID-19 and aggressive measures taken world-wide in response by governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines of large populations, and by businesses, including changes to operations and reducing staff.
Service Shares Prospectus | DREYFUS TREASURY SECURITIES CASH MANAGEMENT | Service Shares  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.20%
Administrative services fees rr_DistributionAndService12b1FeesOverAssets 0.55%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.01%
Total other expenses rr_OtherExpensesOverAssets 0.81%
Total annual fund operating expenses rr_ExpensesOverAssets 1.01%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total annual fund operating expenses (after fee waiver) rr_NetExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 319
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 555
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,234
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 100
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 319
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 555
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,234
Annual Return 2021 rr_AnnualReturn2021 0.01%
Annual Return 2022 rr_AnnualReturn2022 0.89%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.89%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.42%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 16, 2020
[1] The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has contractually agreed, until June 1, 2024, to waive receipt of a portion of its management fee in the amount of .03% of the value of the fund's average daily net assets. On or after June 1, 2024, BNY Mellon Investment Adviser, Inc. may terminate this waiver agreement at any time.